Uninterruptible power supply



FIG. 1 is a perspective view of an uninterruptible power supply of our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a back elevational view thereof

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an uninterruptible power supply, as shown and described. 